diff --git a/homeassistant/components/swiss_public_transport/__init__.py b/homeassistant/components/swiss_public_transport/__init__.py
index 0d0c4dc6169..49fe9949772 100644
--- a/homeassistant/components/swiss_public_transport/__init__.py
+++ b/homeassistant/components/swiss_public_transport/__init__.py
@@ -35,7 +35,7 @@ from .coordinator import (
     SwissPublicTransportDataUpdateCoordinator,
 )
 from .helper import offset_opendata, unique_id_from_config
-from .services import setup_services
+from .services import async_setup_services
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -47,7 +47,7 @@ CONFIG_SCHEMA = cv.config_entry_only_config_schema(DOMAIN)
 
 async def async_setup(hass: HomeAssistant, config: ConfigType) -> bool:
     """Set up the Swiss public transport component."""
-    setup_services(hass)
+    async_setup_services(hass)
     return True
 
 
diff --git a/homeassistant/components/swiss_public_transport/services.py b/homeassistant/components/swiss_public_transport/services.py
index 3abf1a14b9f..1ac116b4ca9 100644
--- a/homeassistant/components/swiss_public_transport/services.py
+++ b/homeassistant/components/swiss_public_transport/services.py
@@ -8,6 +8,7 @@ from homeassistant.core import (
     ServiceCall,
     ServiceResponse,
     SupportsResponse,
+    callback,
 )
 from homeassistant.exceptions import HomeAssistantError, ServiceValidationError
 from homeassistant.helpers.selector import (
@@ -39,7 +40,7 @@ SERVICE_FETCH_CONNECTIONS_SCHEMA = vol.Schema(
 )
 
 
-def async_get_entry(
+def _async_get_entry(
     hass: HomeAssistant, config_entry_id: str
 ) -> SwissPublicTransportConfigEntry:
     """Get the Swiss public transport config entry."""
@@ -58,34 +59,36 @@ def async_get_entry(
     return entry
 
 
-def setup_services(hass: HomeAssistant) -> None:
+async def _async_fetch_connections(
+    call: ServiceCall,
+) -> ServiceResponse:
+    """Fetch a set of connections."""
+    config_entry = _async_get_entry(call.hass, call.data[ATTR_CONFIG_ENTRY_ID])
+
+    limit = call.data.get(ATTR_LIMIT) or CONNECTIONS_COUNT
+    try:
+        connections = await config_entry.runtime_data.fetch_connections_as_json(
+            limit=int(limit)
+        )
+    except UpdateFailed as e:
+        raise HomeAssistantError(
+            translation_domain=DOMAIN,
+            translation_key="cannot_connect",
+            translation_placeholders={
+                "error": str(e),
+            },
+        ) from e
+    return {"connections": connections}
+
+
+@callback
+def async_setup_services(hass: HomeAssistant) -> None:
     """Set up the services for the Swiss public transport integration."""
 
-    async def async_fetch_connections(
-        call: ServiceCall,
-    ) -> ServiceResponse:
-        """Fetch a set of connections."""
-        config_entry = async_get_entry(hass, call.data[ATTR_CONFIG_ENTRY_ID])
-
-        limit = call.data.get(ATTR_LIMIT) or CONNECTIONS_COUNT
-        try:
-            connections = await config_entry.runtime_data.fetch_connections_as_json(
-                limit=int(limit)
-            )
-        except UpdateFailed as e:
-            raise HomeAssistantError(
-                translation_domain=DOMAIN,
-                translation_key="cannot_connect",
-                translation_placeholders={
-                    "error": str(e),
-                },
-            ) from e
-        return {"connections": connections}
-
     hass.services.async_register(
         DOMAIN,
         SERVICE_FETCH_CONNECTIONS,
-        async_fetch_connections,
+        _async_fetch_connections,
         schema=SERVICE_FETCH_CONNECTIONS_SCHEMA,
         supports_response=SupportsResponse.ONLY,
     )